/*
 * SonarQube
 * Copyright (C) 2009-2023 SonarSource SA
 * mailto:info AT sonarsource DOT com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package org.sonar.ce.task.projectanalysis.step;

import java.util.Optional;
import org.sonar.api.utils.System2;
import org.sonar.ce.task.log.CeTaskMessages;
import org.sonar.ce.task.log.CeTaskMessages.Message;
import org.sonar.ce.task.projectanalysis.analysis.AnalysisMetadataHolder;
import org.sonar.ce.task.projectanalysis.component.TreeRootHolder;
import org.sonar.ce.task.projectanalysis.period.NewCodePeriodResolver;
import org.sonar.ce.task.projectanalysis.period.Period;
import org.sonar.ce.task.projectanalysis.period.PeriodHolder;
import org.sonar.ce.task.projectanalysis.period.PeriodHolderImpl;
import org.sonar.ce.task.step.ComputationStep;
import org.sonar.db.DbClient;
import org.sonar.db.DbSession;
import org.sonar.db.newcodeperiod.NewCodePeriodDao;
import org.sonar.db.newcodeperiod.NewCodePeriodDto;

import static org.sonar.db.newcodeperiod.NewCodePeriodType.REFERENCE_BRANCH;

/**
 * Populates the {@link PeriodHolder}
 * <p/>
 * Here is how these periods are computed :
 * - Read the new code period from DB
 * - Try to find the matching snapshots from the setting
 * - If a snapshot is found, a period is set to the repository, otherwise fail with MessageException
 */
public class LoadPeriodsStep implements ComputationStep {

  private final AnalysisMetadataHolder analysisMetadataHolder;
  private final NewCodePeriodDao newCodePeriodDao;
  private final TreeRootHolder treeRootHolder;
  private final PeriodHolderImpl periodsHolder;
  private final DbClient dbClient;
  private final NewCodePeriodResolver resolver;
  private final CeTaskMessages ceTaskMessages;
  private final System2 system2;

  public LoadPeriodsStep(AnalysisMetadataHolder analysisMetadataHolder, NewCodePeriodDao newCodePeriodDao, TreeRootHolder treeRootHolder,
    PeriodHolderImpl periodsHolder, DbClient dbClient, NewCodePeriodResolver resolver, CeTaskMessages ceTaskMessages, System2 system2) {
    this.analysisMetadataHolder = analysisMetadataHolder;
    this.newCodePeriodDao = newCodePeriodDao;
    this.treeRootHolder = treeRootHolder;
    this.periodsHolder = periodsHolder;
    this.dbClient = dbClient;
    this.resolver = resolver;
    this.ceTaskMessages = ceTaskMessages;
    this.system2 = system2;
  }

  @Override
  public String getDescription() {
    return "Load new code period";
  }

  @Override
  public void execute(ComputationStep.Context context) {
    if (!analysisMetadataHolder.isBranch()) {
      periodsHolder.setPeriod(null);
      return;
    }

    String projectUuid = getProjectBranchUuid();
    String branchUuid = treeRootHolder.getRoot().getUuid();
    String projectVersion = treeRootHolder.getRoot().getProjectAttributes().getProjectVersion();

    var newCodePeriod = analysisMetadataHolder.getNewCodeReferenceBranch()
      .filter(s -> !s.isBlank())
      .map(b -> new NewCodePeriodDto().setType(REFERENCE_BRANCH).setValue(b))
      .orElse(null);

    try (DbSession dbSession = dbClient.openSession(false)) {
      Optional<NewCodePeriodDto> branchSpecificSetting = getBranchSetting(dbSession, projectUuid, branchUuid);

      if (newCodePeriod == null) {
        newCodePeriod = branchSpecificSetting
          .or(() -> getProjectSetting(dbSession, projectUuid))
          .or(() -> getGlobalSetting(dbSession))
          .orElse(NewCodePeriodDto.defaultInstance());

        if (analysisMetadataHolder.isFirstAnalysis() && newCodePeriod.getType() != REFERENCE_BRANCH) {
          periodsHolder.setPeriod(null);
          return;
        }
      } else if (branchSpecificSetting.isPresent()) {
        ceTaskMessages.add(new Message("A scanner parameter is defining a new code reference branch, but this conflicts with the New Code Period"
          + " setting of your branch. Please check your project configuration. You should use either one or the other but not both.", system2.now()));
      }

      Period period = resolver.resolve(dbSession, branchUuid, newCodePeriod, projectVersion);
      periodsHolder.setPeriod(period);
    }
  }

  private Optional<NewCodePeriodDto> getBranchSetting(DbSession dbSession, String projectUuid, String branchUuid) {
    return newCodePeriodDao.selectByBranch(dbSession, projectUuid, branchUuid);
  }

  private Optional<NewCodePeriodDto> getProjectSetting(DbSession dbSession, String projectUuid) {
    return newCodePeriodDao.selectByProject(dbSession, projectUuid);
  }

  private Optional<NewCodePeriodDto> getGlobalSetting(DbSession dbSession) {
    return newCodePeriodDao.selectGlobal(dbSession);
  }

  private String getProjectBranchUuid() {
    return analysisMetadataHolder.getProject().getUuid();
  }
}
